Chuka Umunna

Umunna was the author of an alternative Labour Party amendment to the government’s legislative agenda that highlighted Brexit divisions with his party. He will keep the pressure on the Labour leadership in the months ahead.

Umunna is ambitious and frequently tipped as a future leader of the Labour Party.

PARTY: Labour

POSITION: Former shadow business secretary, backbench MP

MP SINCE: 2010

REMAINIAC OR BREXTREMIST: Remain

Return to the full list of 40 Brexit troublemakers to discover who to watch as legislation disentangling Britain from the European Union goes through the U.K. parliament. For an explanation of how this list was compiled, see here.